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// Copyright (C) 2008 Davis E. King (davis@dlib.net), Nils Labugt
// License: Boost Software License See LICENSE.txt for the full license.
#ifndef DLIB_PNG_IMPORT
#define DLIB_PNG_IMPORT
#include <memory>
#include "png_loader_abstract.h"
#include "image_loader.h"
#include "../pixel.h"
#include "../dir_nav.h"
#include "../test_for_odr_violations.h"
namespace dlib
{
struct LibpngData;
class png_loader : noncopyable
{
public:
png_loader( const char* filename );
png_loader( const std::string& filename );
png_loader( const dlib::file& f );
~png_loader();
bool is_gray() const;
bool is_graya() const;
bool is_rgb() const;
bool is_rgba() const;
unsigned int bit_depth () const { return bit_depth_; }
template<typename T>
void get_image( T& t_) const
{
#ifndef DLIB_PNG_SUPPORT
/* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
You are getting this error because you are trying to use the png_loader
object but you haven't defined DLIB_PNG_SUPPORT. You must do so to use
this object. You must also make sure you set your build environment
to link against the libpng library.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*/
COMPILE_TIME_ASSERT(sizeof(T) == 0);
#endif
typedef typename image_traits<T>::pixel_type pixel_type;
image_view<T> t(t_);
t.set_size( height_, width_ );
if (is_gray() && bit_depth_ == 8)
{
for ( unsigned n = 0; n < height_;n++ )
{
const unsigned char* v = get_row( n );
for ( unsigned m = 0; m < width_;m++ )
{
unsigned char p = v[m];
assign_pixel( t[n][m], p );
}
}
}
else if (is_gray() && bit_depth_ == 16)
{
for ( unsigned n = 0; n < height_;n++ )
{
const uint16* v = (uint16*)get_row( n );
for ( unsigned m = 0; m < width_;m++ )
{
dlib::uint16 p = v[m];
assign_pixel( t[n][m], p );
}
}
}
else if (is_graya() && bit_depth_ == 8)
{
for ( unsigned n = 0; n < height_;n++ )
{
const unsigned char* v = get_row( n );
for ( unsigned m = 0; m < width_; m++ )
{
unsigned char p = v[m*2];
if (!pixel_traits<pixel_type>::has_alpha)
{
assign_pixel( t[n][m], p );
}
else
{
unsigned char pa = v[m*2+1];
rgb_alpha_pixel pix;
assign_pixel(pix, p);
assign_pixel(pix.alpha, pa);
assign_pixel(t[n][m], pix);
}
}
}
}
else if (is_graya() && bit_depth_ == 16)
{
for ( unsigned n = 0; n < height_;n++ )
{
const uint16* v = (uint16*)get_row( n );
for ( unsigned m = 0; m < width_; m++ )
{
dlib::uint16 p = v[m*2];
if (!pixel_traits<pixel_type>::has_alpha)
{
assign_pixel( t[n][m], p );
}
else
{
dlib::uint16 pa = v[m*2+1];
rgb_alpha_pixel pix;
assign_pixel(pix, p);
assign_pixel(pix.alpha, pa);
assign_pixel(t[n][m], pix);
}
}
}
}
else if (is_rgb() && bit_depth_ == 8)
{
for ( unsigned n = 0; n < height_;n++ )
{
const unsigned char* v = get_row( n );
for ( unsigned m = 0; m < width_;m++ )
{
rgb_pixel p;
p.red = v[m*3];
p.green = v[m*3+1];
p.blue = v[m*3+2];
assign_pixel( t[n][m], p );
}
}
}
else if (is_rgb() && bit_depth_ == 16)
{
for ( unsigned n = 0; n < height_;n++ )
{
const uint16* v = (uint16*)get_row( n );
for ( unsigned m = 0; m < width_;m++ )
{
rgb_pixel p;
p.red = static_cast<uint8>(v[m*3]);
p.green = static_cast<uint8>(v[m*3+1]);
p.blue = static_cast<uint8>(v[m*3+2]);
assign_pixel( t[n][m], p );
}
}
}
else if (is_rgba() && bit_depth_ == 8)
{
if (!pixel_traits<pixel_type>::has_alpha)
assign_all_pixels(t,0);
for ( unsigned n = 0; n < height_;n++ )
{
const unsigned char* v = get_row( n );
for ( unsigned m = 0; m < width_;m++ )
{
rgb_alpha_pixel p;
p.red = v[m*4];
p.green = v[m*4+1];
p.blue = v[m*4+2];
p.alpha = v[m*4+3];
assign_pixel( t[n][m], p );
}
}
}
else if (is_rgba() && bit_depth_ == 16)
{
if (!pixel_traits<pixel_type>::has_alpha)
assign_all_pixels(t,0);
for ( unsigned n = 0; n < height_;n++ )
{
const uint16* v = (uint16*)get_row( n );
for ( unsigned m = 0; m < width_;m++ )
{
rgb_alpha_pixel p;
p.red = static_cast<uint8>(v[m*4]);
p.green = static_cast<uint8>(v[m*4+1]);
p.blue = static_cast<uint8>(v[m*4+2]);
p.alpha = static_cast<uint8>(v[m*4+3]);
assign_pixel( t[n][m], p );
}
}
}
}
private:
const unsigned char* get_row( unsigned i ) const;
void read_image( const char* filename );
unsigned height_, width_;
unsigned bit_depth_;
int color_type_;
std::unique_ptr<LibpngData> ld_;
};
// ----------------------------------------------------------------------------------------
template <
typename image_type
>
void load_png (
image_type& image,
const std::string& file_name
)
{
png_loader(file_name).get_image(image);
}
// ----------------------------------------------------------------------------------------
}
#ifdef NO_MAKEFILE
#include "png_loader.cpp"
#endif
#endif // DLIB_PNG_IMPORT
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